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Don't be COMPLETELY pessimistic in the face of function calls

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@12413 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2004-03-15 04:08:36 +00:00
parent c87f0bb345
commit 5b5f7c11d0
1 changed files with 20 additions and 4 deletions
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24
lib/Analysis/AliasSetTracker.cpp
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@ -93,9 +93,21 @@ void AliasSet::addPointer(AliasSetTracker &AST, HashNodePair &Entry,
RefCount++; // Entry points to alias set...
}
void AliasSet::addCallSite(CallSite CS) {
void AliasSet::addCallSite(CallSite CS, AliasAnalysis &AA) {
CallSites.push_back(CS);
AliasTy = MayAlias; // FIXME: Too conservative?
if (Function *F = CS.getCalledFunction()) {
if (AA.doesNotAccessMemory(F))
return;
else if (AA.onlyReadsMemory(F)) {
AliasTy = MayAlias;
AccessTy = Refs;
return;
}
}
// FIXME: This should use mod/ref information to make this not suck so bad
AliasTy = MayAlias;
AccessTy = ModRef;
}
@ -129,7 +141,11 @@ bool AliasSet::aliasesPointer(const Value *Ptr, unsigned Size,
}
bool AliasSet::aliasesCallSite(CallSite CS, AliasAnalysis &AA) const {
// FIXME: Too conservative!
// FIXME: Use mod/ref information to prune this better!
if (Function *F = CS.getCalledFunction())
if (AA.doesNotAccessMemory(F))
return false;
return true;
}
@ -213,7 +229,7 @@ void AliasSetTracker::add(CallSite CS) {
AliasSets.push_back(AliasSet());
AS = &AliasSets.back();
}
AS->addCallSite(CS);
AS->addCallSite(CS, AA);
}
void AliasSetTracker::add(Instruction *I) {